Rotary operative fastener device and installation of the same



Aug. I7, 1943. A. 3.v MAYNARD '2,327,327

ROTARY OPERATIVE FASTENER DEVICE AND INSTQLLATION OF THE SAME Filed June25, 1941 2 SheetS-Sheetvl y WW 3233'.

Aug 17, 1943. A. c. MAYNARD 2,327,327

ROTARY OPERATIVE FASTENER DEVICE AND INSTALLATION OF THE SAME Filed June25, 1941 2 'sheets-sheet 2 Y ,I In Y @myn/ard. B3 grew. 35cm,

Patented Aug. 179 1943 s'rATss en.

FFlCE EtTARY DPERAT FA'EENER DEVICE AND INST .illliert C.

United=Carr Fastener orporatlon,J

"EIIGN Ulli "EME i l il..

Maynard,

nd, Salir.. assigner to Cambridge.

(Halma.

rlhis invention aims to provide improvements in fastener devices iorsecuring together two or more members preferably platenlilse. the devicebeing of the so-called rotary operative type and adapted to draw theplates together on rotation of one part oi the device relative to theother.

The chief object oi my invention is the provision of a fastener deviceproviding a socket unit which cooperates with a rotary stud unit in amanner to draw the parts to he secured firmly together. One oi' thefeatures of my invention is directed to the provision of a shim memberforming a part of the socket unit and acting as a rigid support for alateral projection carried by a stud member, thereby melting itimpossible for the plates to move apart natwise more than a fewthousandths of an inch. The shim mehrI eers may be formed tohavediderent thicknesses cooperating with stud members which may providevarying distances between the shim engage ing projection and stud headto enable L*the fastener device to he used to secure together plates ofany desired combined tlfiiclrness within a de range.

Other objects and uses ci my invention will ce apparent from inspectionof the drawings and specification hereinbelow set forth.

Referring to the drawings in which I have illustrated a preferredembodiment oi :my ina vention:

Fig. 1 is a front elevation of the installation showing two platessecured in face-to-iace relation by my improved fastener device;

Fig. 2 is a rear view of the installation shown in Fig. l;

Fig. 3 is the section taken along the line Of Fig. l;

Fig. 1i is a section taken of Fig. 1;

Fig. 5 is a section italien on Fig. 3;

Fig. 6 is a side elevation oi the stud engaging or socket unit forming apart oi my fastener along the line l-l the line 5-5 of device;

im. 2li-ttm Fig. i2 is a section taken on the line lt--lz of Fit. il;

Fig. i3 is a plan view oi another form of s plate; and

Fig. illis a section talien along the line idf-it of Fig. it.

Referring to the prei-erred forms vci my iastener device illustrated inFigs. l.-lo, the fastener devices shown therein diii'er only in thedimensions of their parts, the mechanical operation of each of thedevices being substantially the same in each case, and for' that reasonthe same ninnbers will he used to indicate equivalent elementsthroughout the various nein-es. My preferred fastener device, asillustrated in the drawings, comprises two units, namely: a studengaging or socket unit l and a rotary stud unit 2. The

y socket unit l is secured on the inner side .t of a incl flatsupporting plate l which is one oi the parts to he secured, and therotary unit 2 is carried by a supporting plate t which is the other partto be secured. The plate l in my preferred form has a circular aperturefor receiving a portion of the rotary unit t and the plate t has anopensurrounded by a nastro-conical embossrnent t which projects into theopening t when the plates are finally secured together so that they maylie in nush relation.

Referring in detail to the construction of my improved socket unit l ihave shownone made up of two elongated main pieces comprisingaplate-like fastener element or shim plate t and a locking member orspring plate it with the pieces disposed in superposed relation. Theparts t and lll are preferably in assembled relation prior to attachmentof the unit to the plate t and the spring member lll is looselyassembled with the shim il so as to der relative to the shim for apurpose to he described.

The shim plate il, illustrated in Figs. 1-10 of the drawings, is formedfrom a fiat piece of stoel; and has a central opening ll. Slots lik-l2are provided on opposed sides of the opening ll (Fig. 5) incitingsurfaces it are provided on opposite sides of the opening il and in theinstallations shown in the drawings arc-shaped emhossments it areprovided adjacent the openmg ll to raise the locking surfaces apredetered distance from the normal plane oi the pla for a purpose to bedescribed. A stop portion in the form of a lug l5 extends upwardly fromthe vplane of each locking surface lll at one end of the respectiveembossment to limit rotation of the stud unit. Supporting elements I6are provided near the longitudinal ends ll of the shim plate and act tosupport the spring member lil in flnal the plates into superposedposition with the aperassembly of the parts. The elements I6 are ture 1of the plate 5 in substantial alignment with raised from the normalplane of the plate in the the opening l l of the shim plate. During thisinstallation shown in the drawings to space the Operation the shank 35of the stud unit will pass spring member I a predetermined distance fromthrough the opening II of the shim plate and the surfaces I3 of theembossments i4 for a puralso through the opening I8 of the springmempese te be described, ber. The free ends 39 of the pin 36 are now inThe spring member i0 is preferably bowed registration with the slotsIii-I9 of the spring longitudinally and provides an aperture iii memberand the free ends 40 of the pin 31 are adapted to align with theaperture il of the shim 1o in registration with the slots i2 of the shimplate when the parts of the socket unit are in plate. Rotation of thestud unit in a clockwise from opposite sides of the aperture I8, as mosttool inserted in the slot 4I (Fig. 2) causes the clearly shown in Fig.1, a predetermined distance ends 39 of the pin 36 t0 engage the camportions toward the longitudinal ends of the member IU. 2li of thespring member I0 and the spring will The plate member I0 providesembossments on thus be compressed until the pin ends reach the oppositesidesof the aperture I8 and these em- 10Cking reCesses 22 adjacent thestops 2| Where bossments are preferably of arc-shape. Each the fasteneris in locked position and is held embossment has a gradually rising camsurface against accidental unlocking by the tension of the 2n extendingfrom a low point adjacent one of 20 spring against the crosspin 36.While the pin the slots I9 and continuing to a high point 2| 36 is beingrotated into locking engagement with adjacent the other slot. Anindentation is prothe plate member l0 the pin 31 has also been videdintermediate the ends of each embossed rOtated into iilJOsiiiQnsubstantially as shown in' portion providing locking recesses 22 adaptedto Figs. 3 and 4 with its ends 40 bearing against receive lateralprojections carried by the rotary 25 locking surfaces I3 0f theembossments I4 of the stud unit 2, as will be more fully described inshim plate. Thus, the plate members 4 and 5 connection with theoperation of the fastener. are held. betWeen the head 34 of the Studunit In assembling the shim plate 9 and the spring and the crosspin 31against any substantial movemember I 0 as a unit, the parts are ilrstdisposed ment away from each other. As a result any in superposedposition with the slots I9 'of the 30 pressure tending to force theplates 4 and 5 away spring member I0 in alignment with openings 23 fromeach other atWiSe are resisted by the (Fig, 3) in the raised elements I6of the shim clamping action between the stud head and the member. Theparts are secured together in my pin 37 preferred form through means ofa pair of hol- A different stud member is shown in each of low bushings(Fig. 6) each of which provides a 35 the three installations set out inthe drawings. head portion 25 overlying the spring member I0 The Studmembers are identical except that the and a shank 26 extending throughthe slot I9 length of the shank and the distance between the and havinga lower shoulder 21 resting on the pin 31 and the stud head 34 varies ineach of the raised portion I 6 to maintain the head 25 in prethreeforms. The same shim Plate, hOWeVel, iS determined spaced positionrelative to the shim 40 used in all the installations having embossmentsmember. A reduced neck 2a extends from the i4 of a height which, forpurposes of illustration. shank 26 through the opening 23 of the shimmay be considered the maximum. The purpose plate and the neck is headedover as at 29 on an 0f Varying the dimensions of the stud member isopposite side of the pmt@ from the shoulder 21 to enable the fastenerdevice to be used to seto secure the parts in initial assembly as a unitCure plates having varying combined thickas shown in Fig 6, nesses.Thus, in the installation shown in Figs. The socket unit is secured tothe inner side 14 the distance between the pin 31 and the stud 3 of theplate 4 through means of a solid pin head is relatively short with theresult that the (Fig. 3) which has a head 30 of greater diamstud unit isoperable to secure together plates eter than thelbore of the bushingdisposed adwhich are relatively thin. In the installation of jacent thehead 25 of the bushing and a shank Figs- 7 and 8 the Shank is longer andthe pin 31 3| which extends through the bore of the bushis spaced agreater distance from the stud head ing and an opening 32 of the plate 4The shank 34. Thus, the fastener is operable to secure 3| has a head 33received within e oountersunk plates which have a greater combinedthickness hole of the plate 4. than that of the plates illustrated inFigs. 1-4. In The rotating unit 2 comprises a head portion theinstallation ShOWIl in Figs. 9 and -0 the Shaft 34 which is larger indiameter than the opening is the longest and pin 31 is'spaced an evengreatof the plate 5 so es te Cooperate with the mete er distance fromthe head 34. Consequently, the 5 in bearing engagement therewith, Ashank last-mentioned device is capable of securing an 35, which issmaller in diameter than the openinstallation 0f greater thickness thanthat illusjng 1, extends through the Opening 7 and carries trated ineither of the other installations. Thus, a, pairl ofcrosspins SI5- 31.The. crosspins are by using the same socket unit with the three spaced apredetermined distance one from anforms of stud units illustrated it ispossible to other axially of the shank and the crosspin 31 securetogether installations of three thicknesses intermediate the pin 36 andstud head 34 is spaced 65 which vary substantially one from the other. apredetermined distance from the stud head 3Q lIn commercial practice, toillustrate the utility for a purpose to be described. A strengthening ofthe fastener, the combined thickness of the grommet 38 (Fig. 10)overlapping opposite sides plates in the installation shown in Figs. 1-4of the embossment 8 of the plate 5 adjacent the would be about .075 ofan inch. 'I'he thicknes opening 1 operates to strengthen the installa-70 of the plates shown in Figs. 7 and 8 would be tion and prevent thehead 34 from pulling about .175 of an inch and the thickness of thethrough the opening 1 of the lower plate during plates shown in Figs. 9and 10 would be about .275 operation of the fastener. of an inch. An iTo assemble the plates 4 and 5 by means of my ate those mentioned abovecan be taken care of improved fastener it is only necessary to bring bysubstituting for the shim plate illustrated in iinal assembly. A pair ofslots |9-l9 extends direction viewing Fig. 2 by a suitable rotating Ythe installations of the drawings, shim plates ranging'from those havingno embossments, such as that shown in Figs. 11 and 12 to shims such asshown in Figs. 13 and 14, in which the embossments project a distanceintermediate zero and the maximum. Thus, if any one of the three-installation thicknesses mentioned above is increased an amount nogreater than .099 of an inch the same stud is used, but a shim plate issubstituted in which the height of the embossments is decreased anamount equivalent to the increase of the installation thickness.' As anexample, using the same figure .'2'75 of an inch as'the thickness of theinstallation shown in Figs. 9 and 10 and taking .090 of an inch for theheight of the embossrnents if it is desired to increase the thickness ofthe installation to .355 of an inch a shim plate would be substituted,having embossments of a height of about .010 of an inch.

While I have illustrated and described preferred embodiments of myinvention I do not wish to be limited thereby, because the scope of myinvention is best defined by the following claims.

I claim: l

l. In a fastener device of the rotary operative type, a completely rigidplate-like element adapted to be secured to one of the parts to befastened, said plate-like element vhaving an aperture and embossmentsadjacent said aperture on opposed sides thereof, arotary member carriedby another of the parts to be fastened having a shank adapted to passthrough the aperture in' said plate-like element, a crosspin assembledwith said shank having its free ends projecting laterally on opposedsides of said shank, said free ends being adapted to engage saidembossments upon relative rotation of the parts, a stud-holding springmember preassembled with said platelike element, said shank having meansin cooper. ative fastener engagement with said spring member to maintainsaid free ends in fastener engagement with said embossments.

2. In a fastener device of the rotary operative type, a completelylrigid plate-like element adapted to be secured to one of the parts to befastened, said plate-like element having an aperture and embossmentsadjacent said aperture on opposed sides thereof, a rotary member carriedby another 'of the parts to be fastened having a shank adapted to passthrough the aperture in said plate-like element, a crosspin assembledwith said shank having its free ends projecting laterally on opposedsides of said shank, said free ends being adapted to engage saidembossments upon relative rotation of the parts, a stud-hold-v ingspring member carried by said first part to be fastened, said shankhaving means` in cooperative fastener engagement with said spring memberto maintain said free ends in fastener engagement with said embossmentsand each of said ture in said shim plate and having spaced pinastud-engaging unit adapted to be secured to embossinents having a stopportion limiting rotary movement of said pin ends. 1

3. In a fastener device of the rotary operative type, a shimplateadapted to be secured to one of the parts to be fastened, said shimplate having an aperture, a raised locking surface adjacent saidaperture and raised portions near opposed ends of said shim plate, arotary member carried by another of the parts to be fastened having ashank adapted to pass through the aperlike lateral projections, one ofsaidprojections adapted to engage said locking surface on relativerotation of the parts, and a bowed spring member in assembly with saidshim plate and disposed in superposed relation thereto, said springmember having its ends supported by said raised portions for the purposedescribed and said spring member having a cam cooperating with the otherof said projections to hold the parts in fastened relation.

4. In a fastener device of the rotary operative type, a stud-engagingunit adapted to be secured to one of the parts to be fastened, said unitcomprising a completely rigid plate-like element and a spring member inpreassembled relation prior to attachment of said unit to said part tobe fastened, said plate-like element having an aperture and a lockingsurface adjacent said aperture, a rotary member carried by another ofthe parts to be fastened having a shank adapted to project through theaperture in said plate element and having a lateral projection adaptedto engage said locking surface upon relative rotation of the parts andysaid shank having means in cooperative fastener engagementwith saidspring member to maintain said projection in fastener engagement withsaid plate element.

5. In a fastener device of the rotary operative type, a stud-engagingunit adapted to be secured to one of the parts to be fastened, said unitcomprising a shim plate and a bowed spring member in superposedrelation, attaching means extending through said spring member and shimplate to hold said parts in loose assembly prior to' attachment of saidunit to one of said parts to be fastened, said shim plate having anaperture and a locking surface adjacent said aperture, a rotary membercarried by another of'the parts to be fastened having a shank adapted toproject through the aperture in said plate element and havinga pin-likelateral projection adapted to engage said locking surface upon` relativerotation of the parts and said shank having means in cooperativefastener engagement with said spring member to maintain said projectionin fastener engagement with said plate element.

6. In a fastener device of rotary operative type,

one of the parts to be fastened, said unit com= prising a rigid shimplate and a bowed spring plate in superposed relation, hollow bushingsextending through said shim plate and spring plate and having shoulderson opposed sides of said parts to hold the same in assembly prior toattaching said unit to one of said parts to be fastened, said shim platehaving an aperture and locking surfaces on opposed sides of saidaperture, said spring plate having an aperture in registration 'withsaid aperture of said shim plate and carn surfaces adjacent saidaperture of said spring plate, a rotary member having a shank adapted toproject through the apertures in said spring plate and shim plate,spaced crosspins assembled with said shank, one of said pins having itsends engaging said locking surfaces of said shim plate on relativerotation of said parts, and the other of said pins cooperating with saidcams of said spring plate to hold the parts in fastened relation.Y

ALBERT C; MAYNARD.

